Malicious PDF — malware analysis report

Static analysis result for SHA-256 10524e9d4d8f94b1…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 06:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58f1a77035e8837bf20c9fba297df3b8 SHA-1: c5ac5360c2ab84ddbf1b4cf81d8048b03c1d212b SHA-256: 10524e9d4d8f94b12e8847d9f409c524afd7a921f83e55aefbcd4c2c8d1d8c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60ec556e2c30b722db3b9dcb678dd1d2/99402902302.pdf
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/36314775599.pdf
    • http://axwelindia.com/uploads/23140327573.pdf
    • http://bachova-terapia.sk/images/file/53239383068.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609664efd8341---95939915217.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1b3e732a---60087055527.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b9d897b1---83501163628.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2e9dc8005cbd5951277cd2e2a138cabb/vobopajusenisados.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qn5466gbvsuaoebvunkr2p7bt2/lefupezawepatokini.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf1247891---77103912965.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1e8d69c2---56856019559.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2228560c76cec25a6ebaf684997c158e/79300924272.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b7164b136---78121379815.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dbif6saii0b6i4j72pcpjovuh4/67989042967.pdf
    • http://cartopack.com/Images/file/65773913556.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4tie81t86l7s50mplc0v31jq0t/noxodirefajov.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c3f71d85---jasuxesazax.pdf
    • http://caramelitos.sk/files/53376547882.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/586602b7b46038240b937b84ec04b106/28573772722.pdf
    • http://arslanemlak.come/file/5532418062.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bd6r3nqrv2jj94f7pqobdklil1/xavidogow.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee747d39d---18514252586.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a0b75060---mevovulubavepubajudeg.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160845f9952280---jesobitelopejo.pdf
    • http://drukarnia-warszawa.pl/pliki/file/zisorij.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7587bc4029fdafd9ea0e3490f642fb48/jurevagofaluba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+man+of+lawlessness+is+revealed+bible+verse
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f477.bin
16910621779dcaf4567cf62417ad732c622635142b9083792d6cf4b144411f76
pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10776 bytes
font_01_sfnt_off00010d1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 16792 bytes
font_02_sfnt_off0001252c.bin
49a3dfc23f84d6d2faed40640a51db1742ddccaf4b7deb48e7b723cc6b52001a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 16868 bytes